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Method and device for contactless level and interface detection

a technology of contactless level and interface detection, applied in the field of methods, can solve the problems of contaminated substances, unnecessary wear, and hazardous substances as such, and achieve the effect of convenient access

Inactive Publication Date: 2009-03-12
AGELLIS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]In many situations where materials are divided into layers in a container, such as in the example of oil tanks, a contact free analysis method is preferable. The reason for this may be that the substance as such is hazardous, reactive to contact detector d

Problems solved by technology

The reason for this may be that the substance as such is hazardous, reactive to contact detector devices, or simply provides unnecessary wear to the detector device used, or that the substance itself may be contaminated by contact from probes or other devices.

Method used

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  • Method and device for contactless level and interface detection
  • Method and device for contactless level and interface detection

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Embodiment Construction

[0011]Changes in the pattern of electromagnetic wave fronts represent the most sensitive probes in physics. Electromagnetic waves may penetrate media of varying physical properties, changing its amplitude and phase in a way which is specific to the content of the media. Thus, continuum radiation will be affected when penetrating a media in the sense that the amplitude will be attenuated and the propagation velocity will change, resulting in a sudden change of phase in the interface surface. The radio band is of particular interest in that here waves can penetrate deeper into dusty areas and penetrate through materials which are opaque to visual light.

[0012]U.S. Pat. No. 5,629,706, issued to the inventor of the present invention, discloses a method for measuring the position of a metallurgical melt surface in a furnace or the like, where a metal portion of the melt is covered by a slag layer. The method includes providing a signal generator for generating signals at a plurality of fr...

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PUM

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Abstract

Method and apparatus for determining the thickness of material layers of a container-held (11) substance comprising a first material disposed in an upper layer (101) and a second material disposed in a lower layer (102), by transmitting a radio signal through the substance towards a container portion (13); receiving reflected signals from a surface (12) of the upper layer, a surface (14) of the second layer, and the container portion (13); varying the frequency of the transmitted signal to determine phase displacement between transmitted and reflected signals; determining optical distances to the surfaces and the container portion, dependent on the phase displacements; determining the thickness (L1) of one of said layers dependent on phase displacement through and index of refraction (n1) of that layer; and determining the thickness (L2) of the other layer dependent on the thickness of said one of said layers.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a method and an apparatus for measuring levels of a substance comprising two or more materials devised in a container, which materials are arranged in layers in the container. The method preferably includes measuring the positions of surfaces of the different layers using radio waves.BACKGROUND[0002]In certain circumstances a substance is stored in a container, in which container different materials of the substance are divided into different layers. If the substance comprises two liquid materials which do not mix, such as an oil-based material and a water-based material, the denser material will collect closer to the bottom of the container, and the less dense material will collect closer to the surface. Another example may be a substance comprising a first generally liquid material, into which solid particles of a second material are dispersed. If left to rest, the second material particles will subsequently gather eithe...

Claims

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Application Information

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IPC IPC(8): G01B11/02
CPCG01F23/284G01S13/88G01S13/38
Inventor BAATH, LARS
Owner AGELLIS GROUP